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A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 20 MW and lasts 2.3 ns.
What is the total energy of the pulse?
J
How many photons are emitted in this pulse?
An object has a kinetic energy of 303 J and the momentum of magnitude 22.9 kg·m/s. Find the speed and the mass of the object.
In compressing the spring in a toy dart gun, 0.6 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.08 kg. What is the dart's speed
A 1300 N uniform boom is supported by a cable perpendicular to boom. The boom is hinged at the bottom, and a 2100N weight hangs from its top.
A person walks up a stalled 14 m long escalator in 81 s. When standing on the same escalator, now moving, the person is up in 48 s. How much time would it take that person to walk up the moving escalator?
A disk-shaped merry-go-round of radius 2.63 m and mass 155 kg rotates freely with an angular speed of 0.744 rev/s. find the initial and final kinetic energies for this system
An equilateral triangle has sides of lengthL. Charges of +Q,-2Q,and +3Q are placed at the vertices. Find the electric field midway between the two positive charges
The crates are pulled to the right at a constant acceleration 3m⁄s^2 by a horizontal force F. Calculate (a) the magnitude of the force F and (b) the tension in the rope connecting the blocks. Include the free body diagram or diagrams you used.
he car is suspended beneath the helicopter by a steel cable. Illustrate what is the lift force exerted on the air by the helicopter's rotor?
A proton with kinetic energy of 2.30 × 106 eV is fired perpendicular to the face of a large plate that has a uniform charge density, From what distance should the proton be fired so that it stops right at the surface of the plate
A runner accelerates to a velocity of 5.36 m/s due west in 3 s. His average acceleration is 0.64 m/s2, also directed due west. What was his velocity when he began accelerating
An electron with a speed of 3.55·E5 m/s enters a uniform mangetic field of magnitude 0.0397 T at an angle of 34.5° to the magnetic field lines, Determine the radius of the helical path
How far apart are they when lighter astronaut has move.
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